LM2587T-3.3中文资料

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2024年6月14日发(作者：)

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LM2587

SIMPLE

SWITCHER

5A

Flyback

Regulator

April1998

LM2587

SIMPLESWITCHER

®

5AFlybackRegulator

GeneralDescription

TheLM2587seriesofregulatorsaremonolithicintegrated

circuitsspecificallydesignedforflyback,step-up(boost),and

iceisavailablein4

differentoutputvoltageversions:3.3V,5.0V,12V,andadjust-

able.

Requiringaminimumnumberofexternalcomponents,these

regulatorsarecosteffective,edin

thedatasheetaretypicalcircuitsofboostandflybackregula-

stedareselectorguidesfordiodesandcapacitors

andafamilyofstandardinductorsandflybacktransformers

designedtoworkwiththeseswitchingregulators.

Thepowerswitchisa5.0ANPNdevicethatcanstand-off

tingthepowerswitcharecurrentandthermal

limitingcircuits,

containsa100kHzfixed-frequencyinternaloscillatorthat

eaturesinclude

softstartmodetoreducein-rushcurrentduringstartup,cur-

rentmodecontrolforimprovedrejectionofinputvoltageand

outputvoltagetoleranceof

±

4%,withinspecifiedinputvolt-

agesandoutputloadconditions,isguaranteedforthepower

supplysystem.

Features

n

n

n

n

n

n

n

n

n

Requiresfewexternalcomponents

Familyofstandardinductorsandtransformers

NPNoutputswitches5.0A,canstandoff65V

Wideinputvoltagerange:4Vto40V

Current-modeoperationforimprovedtransient

response,lineregulation,andcurrentlimit

100kHzswitchingfrequency

Internalsoft-startfunctionreducesin-rushcurrentduring

start-up

Outputtransistorprotectedbycurrentlimit,under

voltagelockout,andthermalshutdown

SystemOutputVoltageToleranceof

±

4%maxoverline

andloadconditions

TypicalApplications

n

n

n

n

Flybackregulator

Multiple-outputregulator

Simpleboostregulator

Forwardconverter

FlybackRegulator

DS012316-1

OrderingInformation

PackageType

5-LeadTO-220Bent,StaggeredLeads

5-LeadTO-263

5-LeadTO-263TapeandReel

NSCPackage

Drawing

T05D

TS5B

TS5B

LM2587T-3.3,LM2587T-5.0,LM2587T-12,LM2587T-ADJ

LM2587S-3.3,LM2587S-5.0,LM2587S-12,LM2587S-ADJ

LM2587SX-3.3,LM2587SX-5.0,LM2587SX-12,

LM2587SX-ADJ

OrderNumber

SIMPLESWITCHER

®

and

SwitchersMadeSimple

®

areregisteredtrademarksofNationalSemiconductorCorporation.

©

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AbsoluteMaximumRatings

(Note1)

IfMilitary/Aerospacespecifieddevicesarerequired,

pleasecontacttheNationalSemiconductorSalesOffice/

Distributorsforavailabilityandspecifications.

InputVoltage

SwitchVoltage

SwitchCurrent(Note2)

CompensationPinVoltage

FeedbackPinVoltage

StorageTemperatureRange

LeadTemperature

(Soldering,10sec.)

−0.4V≤V

IN

≤45V

−0.4V≤V

SW

≤65V

InternallyLimited

−0.4V≤V

COMP

≤2.4V

−0.4V≤V

FB

≤2V

OUT

−65˚Cto+150˚C

260˚C

MaximumJunction

Temperature(Note3)

PowerDissipation(Note3)

MinimumESDRating

(C

=

100pF,R

=

1.5kΩ

150˚C

InternallyLimited

2kV

OperatingRatings

SupplyVoltage

OutputSwitchVoltage

OutputSwitchCurrent

JunctionTemperatureRange

4V≤V

IN

≤40V

0V≤V

SW

≤60V

I

SW

≤5.0A

−40˚C≤T

J

≤+125˚C

LM2587-3.3

ElectricalCharacteristics

SpecificationswithstandardtypefaceareforT

J

=

25˚C,andthoseinboldtypefaceapplyoverfullOperatingTemperature

otherwisespecified,V

IN

=

5V.

SymbolParametersConditionsTypical

3.3

20

20

75

3.3

2.0

1.193

260

0.678

151/75

2.259

3.242/3.2343.358/3.366

Min

3.17/3.14

Max

3.43/3.46

50/100

50/100

Units

V

mV

mV

%

V

mV

mmho

V/V

SYSTEMPARAMETERSTestCircuitof

Figure2

(Note4)

V

OUT

OutputVoltageV

IN

=

4Vto12V

∆V

OUT

/

∆V

IN

∆V

OUT

/

∆I

LOAD

η

V

REF

∆V

REF

G

M

A

VOL

Efficiency

OutputReference

Voltage

ReferenceVoltage

LineRegulation

ErrorAmp

Transconductance

ErrorAmp

VoltageGain

I

COMP

=

−30µAto+30µA

V

COMP

=

1.0V

V

COMP

=

0.5Vto1.6V

R

COMP

=

1.0MΩ(Note6)

LoadRegulation

LineRegulation

I

LOAD

=

400mAto1.75A

V

IN

=

4Vto12V

I

LOAD

=

400mA

V

IN

=

12V

I

LOAD

=

400mAto1.75A

V

IN

=

12V,I

LOAD

=

1A

MeasuredatFeedbackPin

V

COMP

=

1.0V

V

IN

=

4Vto40V

UNIQUEDEVICEPARAMETERS(Note5)

LM2587-5.0

ElectricalCharacteristics

SpecificationswithstandardtypefaceareforT

J

=

25˚C,andthoseinboldtypefaceapplyoverfullOperatingTemperature

otherwisespecified,V

IN

=

5V.

SymbolParametersConditionsTypical

5.0

20

20

80

Min

4.80/4.75

Max

5.20/5.25

50/100

50/100

Units

V

mV

mV

%

SYSTEMPARAMETERSTestCircuitof

Figure2

(Note4)

V

OUT

OutputVoltageV

IN

=

4Vto12V

∆V

OUT

/

∆V

IN

∆V

OUT

/

∆I

LOAD

ηEfficiency

LoadRegulation

LineRegulation

I

LOAD

=

500mAto1.45A

V

IN

=

4Vto12V

I

LOAD

=

500mA

V

IN

=

12V

I

LOAD

=

500mAto1.45A

V

IN

=

12V,I

LOAD

=

750mA

2

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